Ebuilds prior to portage-2.2.14_rc1 generate a make.conf PORTDIR setting for backward compatibility with various tools. See these bugs:
So, either these bugs need to be fixed and the corresponding packages stabilized before portage-2.2.14, or else the make.conf compatibility code needs to be added to the portage-2.2.14 ebuild.
>=app-portage/eix-0.30.4 should also be stabilized before portage-2.2.14*
This is fixed in 2.2.14.
I am about to create a portage-2.2.14 stabilization bug. Martin, is eix ready or in the process of being stabilized?
Yes, most arches are already stable, see bug 529510